Well I know Nissan offers locker options in their Nismo package. Any Nissan with a H190 rear end has one I think. They also have a Salisbury-type limited-slip unit on them. Basically the same/similar setup to Toyota, which you'd expect given that the Titan and Forrester compete directly with Toyota models. And Nismo is their answer to TRD.

What are some scenarios that i would need to use the rear diff in my tacoma? would it be used for going uphill on gravel roads or rough terrain?

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OK, without doing any modification the TRD rear locker only engages if the drivetrain is in 4WD low and you are traveling under 5mph (I think). So it's really unusable for driving down a dirt road, going up a hill, etc. Really it's only use is to assist the 4WD low in getting you out of a sticky situation.. like the time I buried my taco to the frame in deep sand, oh and I was pulling a trailer.

The limited slip in the rear axle is far more useful and works in 2WD, 4WD, whatever. and it engages and disengages automatically. That is what helps you on dirt, gravel, snow, ice, and other loose roadways.

That is until you do the mod to free your locker from the above mentioned constraints and engage it whenever you like I have heard that Prerunners have this ability already?

Pretty much what he said, Don't use it in snow or Ice, If you happen to need it, use it in snow only and dont make turns in snow while its on.

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??? why ??? Itll give you more traction, just dont stomp on the gas in snow. It will want to tend to fish tail but keep that in mind and youll be fine. If your in deep at a stop sign unlocked you wont move, lock it and youll get twice the traction.

OK, without doing any modification the TRD rear locker only engages if the drivetrain is in 4WD low and you are traveling under 5mph (I think). So it's really unusable for driving down a dirt road, going up a hill, etc. Really it's only use is to assist the 4WD low in getting you out of a sticky situation.. like the time I buried my taco to the frame in deep sand, oh and I was pulling a trailer.

The limited slip in the rear axle is far more useful and works in 2WD, 4WD, whatever. and it engages and disengages automatically. That is what helps you on dirt, gravel, snow, ice, and other loose roadways.

That is until you do the mod to free your locker from the above mentioned constraints and engage it whenever you like I have heard that Prerunners have this ability already?